package com.heima.gateway.filter;

import com.heima.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Service
@Slf4j
public class AuthFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        ServerHttpRequest request = exchange.getRequest();

        ServerHttpResponse response = exchange.getResponse();

        String url = request.getURI().getPath();

        if (url.contains("/login")) {

            return chain.filter(exchange);
        }
        String token = request.getHeaders().getFirst("token");

        if (StringUtils.isEmpty(token)) {

            response.setStatusCode(HttpStatus.UNAUTHORIZED);

            return response.setComplete();
        }

        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);

            int i = AppJwtUtil.verifyToken(claimsBody);

            if (i == -1 || i == 0) {

                Object userId = claimsBody.get("userId");

                Object userName = claimsBody.get("userName");

                request.mutate().header("userId", userId.toString());
                request.mutate().header("userName", userName.toString());
                return chain.filter(exchange);
            }
        } catch (Exception e) {

            log.error(e.getMessage());
        }

        response.setStatusCode(HttpStatus.UNAUTHORIZED);

        return response.setComplete();
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
